MLA

An Excellent Ballad of a Dreadful Combat Betwen [Sic] Moore of Moore-Hall and the Dragon of Wantley. s.n., 0AD. https://collections.library.yale.edu/catalog/17124894.

APA, 6th edition

An excellent ballad of a dreadful combat betwen [sic] Moore of Moore-Hall and the dragon of Wantley. (0 C.E.). [Poetry, Early works to 1800, Single sheet verse, Broadside poems, Woodcuts England London 1760]. s.n. https://collections.library.yale.edu/catalog/17124894.